Rotary chipper-knife mounting



Oct. 9, 1951 r P. N. OTTERSLAND" 2,570,345

ROTARY CHIPPER-KNIFE MOUNTING 2 Sheets-Shee't '1 Filed March 29, 1946INVENTOR P5 7519-. UZTERSLA N0- Patented Oct. 9, 1951 UNITED STATESPATENT OFFICE 2,570,845 ROTARY CHIPPER-KNIFE MOUNTING Peter N.Ottersland, Watertown, N. Y.

' Application March 29, 1946, Serial No. 657,924

7 Claims.

This invention relates to chipper knives and knife mountings.

Chipper knives are subjected to heavy and severe usage and when used inchipping logs wear rapidly. In order to withstand the severe strainssustained when they engage the logs and cut chips therefrom, they mustbe made of high grade steel and must be very firmly and rigidlysupported.

This invention has for its salient object to provide an improved knifeand knife mounting or support so constructed andarranged that themaximum width of the knife can be utilized and the knife will be firmlyand rigidly held in all positions of adjustment.

Another object of the invention is to provide a knife and knife mountingso relatively constructed and arranged that the knife can be preadjustedin the knife holder -'or retainer to the proper position prior toclamping the knife and holder in position on the chipper disk.

Further objects of the invention will appear from the followingspecification taken in connection with the drawings which form a part ofthis application, and in which Fig. 1-is a fragmentary elevational viewof a portion of a chipper disk illustrating a knife and knife mountingconstructed in accordance with the invention;

Fig. .2 is a sectional elevation taken substantially on line 2-2 of Fig.1, looking in the direction of the arrows;

Fig. 3 is a sectional elevation, on'an enlarged scale, taken at rightangles to Fig. 2 and illustrating a knife, knife retainer, and clampsecured in operative position on a chipper disk;

Fig. 4 is a view similar to Fig. 3 but illustrating the method or meansfor adjusting and backing the knife to secure the full use thereof and,furthermore, illustrating a slightly modified means for holding the rearor inner end of the knife retainer in position;

Fig. 5 is an elevational view of the knife retainer bar;

Figs. 6 and 7 are transverse sectional elevations taken substantially onlines 6-.-6 and 'l-'| of Fig. 5, looking in the direction of the arrows;

Fig. 8 is an elevational view of the backing bar used to form a backingsupport for the knife as it becomes worn and is ground off;

Fig. 9 is an edge view or end elevation of the 7 bar shown in Fig. 8;

Fig. 10 is an elevational view similar to Fig. 8 but showing anotherform of backing bar; and

-V-shaped recess being illustrated as slabbed off Fig. 11 is an endelevation of the bar shown in Fig. 10.

"vided with transverse slots 31.

The invention briefly described consists of a knife mounting for chipperknives. The chipper disk is recessed to receive a holder for the knifeassembly and the knife is adjustably mounted in a retainer bar which isclamped in the holder by clamping means engaging the outer edge portionof the retainer bar and also the inner edge portion thereof. Theretainer bar forms an abutment for the knife and in turn abuts against asurface of the holder which is mounted in the :recess or pocket in thechipper disk. The knife is adjustably mounted in the retainer bar and asthe cutting edge Wears away and is regrourid :the knife can be adjustedoutwardly on the bar to dispose the cutting edge in the correct positionrelative to the retainer bar. As the knife is so adjusted backing meansis secured to the "retainer bar to fill in the space between the rearwill be seen that the cutting edge of each knife is disposed tangent toa circle drawn about the axis of the-chipper disk as a center.

The chipper disk 20' and Wear plate 2| are slotted or provided withopenings 23 which receive the chips cut from the logs by the knives. Thedisk 20 has also formed therein a substantially V-shaped recess 25, theinner end of the or fiat as shown at 26. Thewear plate is also recessed,as shown at 27, this recess communi- -cating with the recess 25 of thedisk 20 and also with the portion of the slot or opening 23 formed inthe wear plate.

Each knife mounting comprises a holder 28 which is substantiallyV-shapedin section, as shown in Figs. 3 and 4, having angularly disposedportions 29 and 30. The portion 30 has an extension 3| which bearsagainst the surface 32 of is so constructed as to fit within the V-shaped recess 25 formed. in the disk 20.

The knife blade or knife 35 is adjustably mounted in a knife retainerbar 36 which is pro- The retainer bar 36 also has spaced, inclinednotches 39 which are cured to the retainer bar by means of bolts 45which extend through the slots 31.

The V-shaped holder 28 is secured in the recess by means of bolts 46.After the knife has been secured by the bolts to the retainer bar 36 inthe manner shown in Fig. 3, the retainer bar is inserted in the holder28 with the back edge 41 of the bar disposed against the s'ur- I face 48of the portion 30 of the holder 28. The retainer bar and knife are thenclamped in position by means of a clamping bar 59 to which are securedthe bolts 46 which extend through the othersurface of the chipper diskand are tightened by means of nuts 51 and locked in tightened positionby set screws52. The clamping bar has an under surface 53 which engagesa shoulder 54 on the portion 30 of the holder 28 and the other edge ofthe clamping bar 58 engages the outer edge portion 55 of the retainerbar 36.

In order to securely hold the inner edge portion of the retainer bar 36,an S-shaped spring 56 is secured by a bolt 51 to the portion 30 of theholder, and when the clamping bar 50 is drawn to clamping position theouter end 58 of the spring 55 will be engaged by the under surface ofthe clamping bar 50', thus forcing the portion 59 of the spring againstthe inner edge portion of the retainer bar 36 in the manner shown inFig. 3.

In Fig. 4 the inner edge portion of the retainer bar 36 is helddownwardly by a bar 6!! which is forced into engagement with theretainer bar by an under portion 6| of the clamping bar 62.

After the knife has become worn and is relower or inner edge or back ofthe knife and the abutment surface 44 of the retainer bar 36 is filledin with backing bars sufficiently wide to completely fill this space. InFig. 4 the backing bar is provided with dowel pins 56 which extend intodowel pin openings 61 formed in the abutment surface 45 of the retainerbar 36. The outer edge of the backing bar 65 is engaged by the inneredge of a second backing bar 68 and the space between the outer edge ofthis backing bar and the rear edge of the knife is filled in by shims69. The backing bar 68 is secured in position by bolts Ill which extendthrough the slots 31. In this manner the necessary backing for the knifeis provided at all times regardless of the width of the knife.

Furthermore, it will be evident that the clamping bar 50 will firmly,securely and rigidly hold the knife and knife retainer bar in positionwith the under surface of the knife disposed against the outer surfacell of the portion 29 of the holder 28.

Although one specific embodiment of the invention has been particularlyshown and described, it will be understood that the invention is capableof modification and that changes-in 4 the construction and in thearrangement of the various cooperating parts may be made withoutdeparting from the spirit or scope of the invention. as expressed in thefollowing claims.

What I claim is:

1. In combination, a rotatable knife carrier having a pocket forreceiving a knife and knife mounting, said knife mounting having a knifesupporting surface adapted for engagement by the. back surface of theknife and an abutment surface, a knife retainer bar having a rear edgeadapted to engage said abutment surface, and

'means for adjustably clamping the knife to said 1 retainer bar andmeans for clamping said retainer bar and knife in said pocket, saidclamping means including resilient means carried by the knife mountingengaging the inner edge portion of the retainer bar.

2. In. combination, a rotatable knife carrier having a pocket, a knifeassembly in said pocket and comprising a member having surfaces disposedsubstantially at right angles to each other,

;one surface being adapted to engage the back surface -of the knife, aknife retainer bar having a rear edge adapted to engage said otherpocket surface and havinga shoulder adapted to form a thrust abutment ofthe knife, means including clamping means engageable with the outer edgeportion of the retainer bar and one end of said member for clamping theassembly in the pocket.

3. In combination, a rotatable knife carrier havinga' pocket .;forreceiving a knife and knife retainer bar-and-separate and additionalmeans for clamping said retainer bar and knife in said pocket,said'clamping means including means engaging both edges of said retainerbar.

4. In combinatiomaknife carrier having a V- shaped recess, a V-shapedknife mounting holder secured in said recess, a knife retainer, a knifeadjustably mounted in said retainer, and means engageable with the edgeportions of said retainer for clamping the retainer and knife in theholder with one surface of the knife disposed against one surface of theV-shaped holder and the edge of the retainer :disposed at the innermostportion of the recess and positioned against the other surface of theV-shaped holder;

5 In combination, a knife carrier having a 'V-shapedsupport for a knife,a knife retainer, a

knife disposed against one surface of thet V- shaped support and an edgeof the retainer against .the other surface of the V-shaped support 6. Incombination, a V-shaped knife holder, a substantially flat kniferetainer, means for adjustably mounting a knife on said retainer, andmeans engageable with the holder and with ,the longitudinaledge portionsof the retainer for securing the knife and retainer in said. holder.

.77; In combination, a rotatable chipper disk, a V-shaped knife holder,means for securing the holder to said disk, a substantially fiat kniferetainer, meansfor adjustably mounting a knife holder and with thelongitudinal edge portions 5 of the retainer for securing the knife andretainer Number in said holder. 375,059 PETER N. OTTERSLAND. 384,491812,078 REFERENCES CITED 5 335 15 The following references are of recordin the 1,683,913 file of this patent: UNITED STATES PATENTS 2,337,407Number Name Date 10 2,388,799

286,980 White Oct. 16, 1883 6 Name Date Francis Dec. 20, 1887 Allen June12, 1888 Norton Feb. 6, 1906 Fitts 1 Nov. 6, 1906 Ahrendt Oct. 23, 1928Hartzell Aug. 3, 1933 Preston et a1 June 29, 1937 Ottersland Dec. 21,1943 Payzer et a1. Nov. 13, 1945

